Talk:Bass reflex

Merge with loudspeaker enclosure ?--Light current 09:52, 24 July 2006 (UTC)

Oh I see loudspeaker enclosure is a sort of summary page is it?--Light current 10:00, 24 July 2006 (UTC)

Resonant bass noticeable
"Because of the complex frequency dependent loading, ported enclosures generally result in poorer transient response at low frequencies than in well-designed sealed box systems. Whether or not the effects of this in a properly designed system are audible are debatable."

I was surprised by this, as I've always thought it noticeable. Because bass reflexes produce resonant bass from the port, this has 2 noticeable effects: Tabby (talk) 13:21, 23 January 2008 (UTC)
 * Firstly resonance takes time to build up, thus the low bass is always time lagged
 * Resonance also does not die down instantly, so the low bass does not have the tight temporal control that a closed box has, rather it is a wolly vague soft and ill timed thing. Sounds fine for easy listening but performs poorly for 'harder' music.
 * Fixed! :-) —Preceding unsigned comment added by 62.1.92.29 (talk) 00:49, 1 July 2008 (UTC)

I read some miss assumptions,

The designer can make many mistakes. You can't say a Bass reflex has poorer transient response, there are several variables.

1) It depends on a right port circumference to be > 30% of Sd good air load no air noise. To small circumference port will sound boomy (resonant).

2) And use a driver with the right parameters for BR. Low QTS about 0,45-0,25 and QES. (Only indication)

3) With low resonance frequency 20-30Hz so the speaker has good air load down to 20Hz by the bass reflex port tuning. So it can't resonate at any audible frequency.

The air load is caused by the opposite resonating air in the port, to the backside off the driver. And will also reduce the cone extrusion at the tuning frequency, benefit low distortion and good controlled drive of the voice coil (motor) at tuning frequency.

4) low BR-tuning brings the group delay to very low frequency's so that isn't audible <20ms (lower then 10msec would be even better).

5) Use efficient drivers so there is less energy storage in the driver/loudspeaker system that could cause a resonance.(driver high SPL small cone-extrusion by big circumference Sd)

When you do it right you have a transient response like a horn loaded speaker and also the sound. And more open dynamic sound than a closed box system.

Regards, Helmuth.Lageschaar

87.208.182.141 (talk) 10:01, 12 December 2009 (UTC)

Re: Explaination
Sorry to say that this is mostly wrong. You need to find an accurate explanation of how a bass reflex enclosure actually works and do a complete rewrite. The current "explanation" is based on unscientific guesses of how they work. These guesses were proven to be incorrect by further research.

If I write an explanation, probably only engineers will understand it.

--Tyrerj (talk) 23:58, 30 May 2017 (UTC)


 * Tyrerj is correct, this article is completely wrong, total BS, and the idea that a human can hear the "time delay of the buildup of resonance" is ridiculous (because a musical note is a resonance, and without the "buildup", which also needs to occur on your eardrum, the ear would not hear a note). In a properly functioning bass reflex system, the resonant frequency of the enclosure/port needs to be matched to the resonant frequency of the loudspeaker driver itself: in this way the free space resonant peak of the driver--which in an infinite baffle would create louder emphasis/boominess at that frequency--gets tamed, actually decreased, due to impedance matching (and correspondingly correcting the electrical impedance at that range of frequencies) https://web.archive.org/web/20000530234216/https://hometheaterhifi.com/volume_5_2/cmilleressayporting.html 98.7.192.88 (talk) 23:50, 28 July 2018 (UTC)

revert
At this edit, Editor Wikiwald reverted my edit with the edit summary Undid revision 1183056760 to ensure citation is in the APA/Chicago style.

This article uses Citation Style 1 templates (cs1). Citation Style 1 is not APA style, is not Chicago style. Yes, cs1 takes style cues from APA, Chicago, and other style guides but is none of them. cs1 also takes style cues from WP:MOS, in this case MOS:JR which says (in part): Do not put a comma before Jr., Sr. (or variations such as Jnr), or a Roman numeral name suffix, whether it is patronymic or regnal: use Otis D. Wright II, not Otis D. Wright, II.

When the surname is shown first, the suffix follows the given name, as Kennedy, John F. Jr. or Wright, Otis D. II. For the reasons described above, I have restored my edit to keep this article out of.

—Trappist the monk (talk) 14:25, 22 November 2023 (UTC)